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"D" Formula SymbolsA - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z | ||||||
|---|---|---|---|---|---|---|
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
| \(P_{total}\) | - | Dalton's law | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(Da\) | - | Damkohler number | dimensionless | dimensionless | dimensionless | - |
| \(\delta\), \(\;\lambda\) | delta , lambda | dampening coefficient | - | - | - | - |
| \(\zeta\) | zeta | damping ratio | dimensionless | dimensionless | dimensionless | - |
| \(f\), \(\;C_f\), \(\;f_d\) | - | Darcy friction factor | dimensionless | dimensionless | dimensionless | - |
| \(f_d\) | - | Darcy friction factor - Brkić | dimensionless | dimensionless | dimensionless | - |
| \(f_d\) | - | Darcy friction factor - free surface flow | dimensionless | dimensionless | dimensionless | - |
| \(f_d\) | - | Darcy friction factor - laminar flow | dimensionless | dimensionless | dimensionless | - |
| \(v\) | - | Darcy velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m - s^{-1}\) | - |
| \(Da\) | - | Darcy's law | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Da\) | - | Darcy number | dimensionless | dimensionless | dimensionless | - |
| \(DW\) | - | Darcy-Weisbach equation | dimensionless | dimensionless | dimensionless | - |
| \(D\) | - | Dean number | dimensionless | dimensionless | dimensionless | - |
| \(De\) | - | Deborah number | dimensionless | dimensionless | dimensionless | - |
| \(w_d\) | - | Debye angular frequency | - | - | - | - |
| \(q_d\) | - | Debye angular wave number | - | - | - | - |
| \(\lambda_d\) | lambda | Debye length | - | - | - | - |
| \(\Theta_d\) | Theta | Debye temperature | - | - | - | - |
| \(D\) | - | Debye-Waller factor | - | - | - | - |
| \(\lambda\) | lambda | decay constant | - | - | - | - |
| \(d\) | - | deceleration | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) | \(m-s^{-2}\) | - |
| \(a\) | - | deceleration rate | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) | \(m-s^{-2}\) | - |
| \(dB\) | - | decibel | dimensionless | - | ||
| \(DSD\) | - | decision sight distance | \(ft\) | \(m\) | \(m\) | - |
| \(d\), \(\; \delta\) | delta | deflection | - | - | - | - |
| \(\delta\) | delta | deformation | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(x\) | - | degree of ionization | - | - | - | |
| \(\mu\), \(\;S\) | mu | degree of saturation | dimensionless | dimensionless | dimensionless | - |
| \(F\) | - | degrees of freedom | - | - | - | - |
| \(\rho\) | rho | density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho_a\) | rho | density of air | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho\) | rho | density (aether) | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | \(9.605125782\;x\;10^{24}\) \(\large{\frac{kg}{m^3}}\) |
| \(\rho_f\) | rho | density of fluid | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho_o\) | rho | density of object | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho_v\) | rho | density of vapor | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho\) | rho | density of an ideal gas | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho\) | rho | density of material due to temperature | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(N_e\), \(\;\rho\) | rho | density of state | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho_w\) | rho | density of water | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(z\) | - | depth | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(\partial\), \(\;d\) | partial | derivative (rate of change) | - | - | - | - |
| \(R^2\) | - | determination coefficient | dimensionless | dimensionless | dimensionless | - |
| \(T_d\) | - | dew point temperature | \(F\) | \(C\) | \(x+273.15\;K\) | - |
| \(d\) | - | diameter | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(\beta\) | beta | diameter ratio | dimensionless | - | ||
| \(\epsilon\) | epsilon | dielectric constant | - | \(\large{\frac{F}{m}}\) | \(F-m^{-1}\) | - |
| \(P\) | - | dielectric polarization | - | - | - | - |
| \(\Delta\) | Delta | differential | - | - | - | - |
| \(D\) | - | diffusion coefficient | \(\large{\frac{ft^2}{sec}}\) | \(\large{\frac{m^2}{s}}\) | \(m^2-s^{-1}\) | - |
| \(L_n\), \(\;L_p\) | - | diffusion length | - | - | - | - |
| \(\alpha\) | alpha | diffusivity | - | - | - | - |
| \(a\), \(\;b\) | - | dimension | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(DA\) | - | dimensional analysis | - | - | - | - |
| \(k_d\) | - | dimensional constant | - | - | - | - |
| \(n\) | - | dimensionless exponent | dimensionless | dimensionless | dimensionless | - |
| \(K\) | - | dimensionless factor | dimensionless | dimensionless | dimensionless | - |
| \(N\), \(DN\) | - | dimensionless number | - | - | - | - |
| \(DC\) | - | direct current | \(I\) | \(\large{\frac{C}{s}}\) | \(C - s^{-1}\) | - |
| \(sigma\) | sigma | direct stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\mu\), \(\;C_d\) | mu | discharge coefficient | dimensionless | dimensionless | dimensionless | - |
| \(d\) | - | displacement | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(q\) | - | discharge velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(km-s^{-1}\) | - |
| \(P\) | - | displacement power | \(\large{\frac{ft-lbf}{sec}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(d\) | - | displacement of piston | - | \(\large{\frac{cm^3}{rev}}\) | \(cm^3-rev^{-}\) | - |
| \(d\), \(\;l\), \(\;x\), \(\;y\) | - | distance | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(s\) | - | distance along cable | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(U\) | - | distance between anchore | \(in\) | \(mm\) | \(mm\) | - |
| \(a\) | - | distance to lowest cable point | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(d_4\) | - | distance traversed by opposing vehicle | \(ft\) | \(m\) | \(m\) | - |
| \(d_2\) | - | distance while passing vehicle occupies left lane | \(ft\) | \(m\) | \(m\) | - |
| \(w\) | - | distributed load | - | - | - | - |
| \(DF\) | - | distribution factor | dimensionless | dimensionless | dimensionless | - |
| \(f_o\) | - | doppler effect | \(Hz\) | \(Hz\) | \(s^{-1}\) | - |
| \(K_2\) | - | downstream resistance coefficient | dimensionless | dimensionless | dimensionless | - |
| \(Y\) | - | apparent density | \(\large{ \frac{lbm}{ft^3} }\) | \(\large{ \frac{kg}{m^3} }\) | \(kg - m^{-3}\) | - |
| \(C_d\) | - | drag coefficient | dimensionless | dimensionless | dimensionless | - |
| \(F_d\) | - | drag force | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(v_{dr}\) | - | drift velocity | - | - | - | - |
| \(\Delta F_c\) | - | driving force concentration differential | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(T\) | - | dry bulb temperature of moist air | - | \(K\) | \(K\) | - |
| \(\zeta\) | zeta | dryness fraction | - | - | - | - |
| \(\rho_{db}\) | rho | dry bulk density of soil | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\large{ \gamma_d }\) | gamma | dry unit weight | \(\large{ \frac{lbm}{ft^3} }\) | \(\large{ \frac{N}{m^3} }\) | \(N-m^{-3}\) | |
| \(Du\) | - | Dukhin number | dimensionless | dimensionless | dimensionless | - |
| \(Q\), \(\;q\) | - | dynamic pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\mu\) | mu | dynamic shear viscosity | \(\large{\frac{lbf-sec}{ft^2}}\) | \(Pa-s\) | \(kg-m^{-1}-s^{-1}\) | - |
| \(a\) | - | dynamic speed constant | - | - | - | - |
| \(\mu\), \(\;\eta\) | mu (used in mechanical), eta (used in chemical) | dynamic viscosity | \(\large{\frac{lbf-sec}{ft^2}}\) | \(Pa-s \) | \(kg-m^{-1}-s^{-1}\) | - |
| \(\mu_w\) | mu | dynamic viscosity of water | \(\large{\frac{lbf-sec}{ft^2}}\) | \( Pa-s \) | \(kg-m^{-1}-s^{-1}\) | - |
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
